CONTENTS OF VOL. V. 



No. 1.— The Dakota- Permian Contact in Northern Kansas.. F. C. Greene. 



2. -Further Notes on the Pueblo Ruins of Scott County, H. T. Martin. 



3. —The Influence of Magnesium Sulphate on the Motor Cells of 



the Cerebral Cortex H. F. Hyndman and W. E. Michener. 



4.— A Study of the Respiratory and Cardiac Activities and Blood 

 Pressure in the Skate Following Intravenous Injections 

 of Salt Solutions Ida H. Hyde. 



5.— The Nutrition of the Embryo Sac and Embryo in Certain 



Lab atge F. H. Billings. 



6.— Mitosis in the Root- tip Cells of Podophyllum peltatum, 



A. Richards. 



7. — Koeberlinia spinosa Zucc. : An Ecological Study of the 



Anatomy of the Stem and some other parts, Miriam Sheldon. 



8. —A Case of Absolute Tone Memory Archibald Hogg. 



9. —The Hackberry Psylla, Pachypsylla celtidis-mammae Riley, 



A Study in Comparative Insect Morphology H. B. Stough. 



10. —Investigations Regarding the Phloem and Food-conduction 



in Plants Frank U. G. Agrelius. 



11.— Histology of Townsendiaexscapa and Lesquerella spathulata. 



Lilian Bunton. 



(ill) 



